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【期刊论文】Optimal control of secondary cooling for medium thickness slab continuous casting
刘青, X.-Y. Wang, Q. Liu*, B. Wang, X. Wang, J.-S. Qing, Z.-G. Hu and Y. H. Sun
Ironmaking and Steelmaking,-0001,():
-1年11月30日
A software to simulate the solidification, heat transfer and water flowrate distribution in slab continuous casting was developed by establishing a mathematical model for the heat transfer and solidification in medium thickness slab casting. This model was validated by pin shooting and surface temperature measurement experiments. A reasonable target surface control temperature was found by testing the high temperature mechanical properties of Nb bearing ship plate steel,and then the water flowrate of each loop of the secondary cooling zone was determined by the software. The influence of uneven secondary cooling in the slab width direction on the quality of the slab was also investigated, which provided data for the optimisation of the secondary cooling of the slab caster. On the basis of the above research, an optimisation scheme for a secondary cooling system was proposed. Experimental results showed that the quality of the slab was significantly improved after optimisation. The centreline macrosegregation was reduced, and the ratio of equiaxed grains was increased by 3?18%. In addition, the transverse cracking of the slab was almost eliminated.
Slab continuous casting,, Mathematical model,, Secondary cooling optimisation,, Ship plate steel
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刘青, 王先勇) 刘青) 胡志刚) 卿家胜) 王欣) 李玉盘) 赵彦华) 孙玉虎) 李金波)
北京科技大学学报,-0001,():
-1年11月30日
含铌钢铸坯出现角部横裂一直是困扰邯钢第三炼钢厂二号板坯连铸机生产的质量问题,本文重点研究了铸机矫直区现行喷嘴布置对板坯冷却效果的影响,并在喷嘴自动化测试平台上进行一系列喷嘴的组合实验,从喷嘴流量、喷射高度、水压三个方面探讨了相邻喷嘴喷淋水重叠度与水量在板坯宽度方向分布均匀性的关系。在此基础上,对现行的二冷喷淋系统提出了优化方案。实验结果表明,优化后铸坯角部横裂基本消除,铸坯中心偏析减轻至C类1.5,其等轴晶比率提高了4.1%,明显地改善了铸坯的内部质量。
板坯连铸, 二次冷却, 喷嘴, 布置, 含铌钢
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